Determinação de parâmetros de alvos submarinos a partir de interferências devidas ao Efeito Lloyd-Mirror

Abstract

This master's dissertation presents the possibility of using the interference due to the Lloyd-Mirror effect in order to determine the parameters of submarine targets, especially its depth. This study was made from recordings of irradiated noise measurements obtained in the acoustic ray of the Center for Analysis of Operating Systems (CASOP) located in Arraial do Cabo, RJ (Brazil). The radiated noise recordings were analyzed from a spectrogram developed during this research. In order to obtain the target movement analysis (AMA) parameters, simulation programs were developed to generate the characteristics of a signal subjected to the Lloyd-Mirror effect taking into account the sound source depth, the distance between the sound source and the receiver, the marking angle that the target makes of the receiver and the relative speed between the sound source and the receiver, and performing the characteristic calculations of a maneuvering rose. The results of these simulations show that, once the target marking direction, depth and receiver speed are known, the spacings between the signal `` minimums '' due to destructive interference can be correlated to a solution for AMA that provides the distance to the target, its speed, heading and the main its depth.